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Номер произв CAV4201
Описание 350 mA High Efficiency Step Down LED Driver
Производители ON Semiconductor
логотип ON Semiconductor логотип 

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CAV4201 Даташит, Описание, Даташиты
CAV4201
350 mA High Efficiency
Step Down LED Driver
Description
The CAV4201 is a high efficiency stepdown converter optimized
to drive high current LEDs. A patented switching control algorithm
allows highly efficient and accurate LED current regulation. A single
RSET resistor sets the full scale LED string current up to 350 mA from
supplies as high as 36 V.
The switching architecture of the CAV4201 results in extremely low
internal power dissipation allowing the device to be housed in a tiny
package without the need for dedicated heat sinking. The device is
compatible with switching frequencies of up to 1 MHz, making it ideal for
applications requiring small footprint and low value external inductors.
Enable, analog dimming and LED shutdown control is provided via a
single input pin, CTRL. Additional features include overload current
protection and thermal shutdown. The device is available in the low
profile 5lead thin SOT23 package and is ideal for space constrained
applications.
Features
LED Drive Current up to 350 mA
Compatible with 12 V and 24 V Standard Systems
Handles Transients up to 40 V
Single Pin Control and Dimming Function
Power Efficiency up to 94%
Drives LED Strings of up to 32 V
Open and Short LED Protection
Parallel Configuration for Higher Output Current
CAV Prefix for Automotive and Other Applications requiring Site
and Change Control
TSOT23 5lead Package
These Devices are PbFree, Halogen Free/BFR Free and are RoHS
Compliant
Applications
12 V and 24 V Lighting Systems
Automotive and Aircraft Lighting
General Lighting
High Brightness 350 mA LEDs
VBAT
9 V C1
4.7 mF
Enable /
Analog Dimming
R1
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5
1
TSOT23
TD SUFFIX
CASE 419AE
PIN CONNECTIONS
1
CTRL
VBAT
GND
RSET
SW
(Top View)
MARKING DIAGRAMS
TFYM
TF = Device Code
Y = Production Year (Last Digit)
M = Production Month: 19, A, B, C
ORDERING INFORMATION
Device
Package
CAV4201TDGT3
TSOT23
(PbFree)
* Plated Finish: NiPdAu
Shipping
3,000/
Tape & Reel
VBAT
CAV4201
CTRL
RSET SW
GND
D C2
10 mF
L
22 mH
350 mA
D: ON Semiconductor MBR0540
L: Sumida CDRH6D26220
See Table 4 and Table 5 for external component selection.
Figure 1. Typical Application Circuit
© Semiconductor Components Industries, LLC, 2011
November, 2011 Rev. 1
1
Publication Order Number:
CAV4201/D







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CAV4201 Даташит, Описание, Даташиты
CAV4201
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameters
Ratings
Units
VBAT, SW, CTRL
0.3 to +40
V
RSET
0.3 to +5
V
Switch SW peak current
1A
Storage Temperature Range
65 to +160
_C
Junction Temperature Range
40 to +150
_C
Lead Temperature
300 _C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
Table 2. RECOMMENDED OPERATING CONDITIONS
Parameters
Ratings
Units
VBAT voltage (Notes 1, 2)
6.5 to 36 (Note 1)
V
SW voltage
0 to 36
V
Ambient Temperature Range
40 to +125
_C
LED Current
50 to 350
mA
Switching Frequency
50 to 1000
kHz
1. The VBAT pin voltage should be at least 3 V greater than the total sum of the LED forward voltages in order to operate at nominal LED current.
2. During powerup, the slew rate of the input supply should be greater than 1 ms for every 5 V increase of VBAT.
Table 3. ELECTRICAL CHARACTERISTICS
(VIN = 13 V, ambient temperature of 25°C (over recommended operating conditions unless otherwise specified))
Symbol
Parameter
Conditions
Min Typ
IQ Operating Supply Current on VBAT pin
ISD
Idle Mode Supply Current on VBAT pin
CTRL = GND
VFB RSET Pin Voltage
2 LEDs with ILED = 300 mA
ILED Programmed LED Current
R1 = 33 kW
R1 = 10 kW
R1 = 8.25 kW
0.4
90
1.15 1.2
100
270 300
350
VCTRLFULL
VCTRLEN
VCTRLSD
ICTRL
CTRL Voltage for 100% Brightness
CTRL Voltage to Enable LEDs
CTRL Voltage to Shutdown LEDs
CTRL pin input bias
RSW
TSD
THYST
h
Switch “On” Resistance
Thermal Shutdown
Thermal Hysteresis
Efficiency
LED enable voltage threshold
LED disable voltage threshold
VCTRL = 3 V
VCTRL = 12 V
ISW = 300 mA
Typical Application Circuit
2.6
0.9
0.4 0.9
40
200
0.9
150
20
86
Max Units
1 mA
mA
1.25 V
mA
330
3.1 V
1.2 V
V
80 mA
1.5 W
°C
°C
%
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CAV4201 Даташит, Описание, Даташиты
CAV4201
TYPICAL OPERATION CHARACTERISTICS
(VIN = 13 V, ILED = 300 mA, L = 22 mH, C1 = 4.7 mF, C2 = 10 mF, TAMB = 25°C unless otherwise specified)
1.0 200
0.8
0.6
0.4
0.2
0
8 10 12 14 16 18 20 22 24
INPUT VOLTAGE (V)
Figure 2. Input Operating Supply Current
250
200
150
100
50
0
0 2 4 6 8 10 12
CTRL VOLTAGE (V)
Figure 4. CTRL Input Bias Current
150
100
50
0
0
1.30
1.25
4
8
12 16
20
INPUT VOLTAGE (V)
Figure 3. Idle Mode Supply Current
(CTRL = 0 V)
VIN = 13 V
24
1.20
1.15
1.10
40
0 40 80
TEMPERATURE (°C)
Figure 5. RSET Voltage vs. Temperature
120
1.4
1.2
1.0
0.8
+25°C
0.6 40°C
+85°C
0.4
0.2
0
01 23
CTRL VOLTAGE (V)
Figure 6. RSET Voltage vs. CTRL Voltage
4
400
300
200
100
0
5
10 15 20 25 30
RSET (kW)
Figure 7. LED Current vs. RSET
35
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